Have you ever seen someone with brown eyes and a blue ring around the outer edge of the brown? It may seem fascinating at first but in fact this could be a sign of some troubling health problems. Many people can get this gray/white/blue ring around the outer edge of their cornea as they get older. This circumferential change in eye color is called arcus senilis and it is often a result of high cholesterol. The ring is reportedly due to cholesterol deposits in the corneal stroma. It generally occurs in both eyes at the same time. If it appears only in one eye that may be a sign of a blockage in the carotid artery. Either way, the development of a new eye color should always prompt a visit to the doctor! So be on the lookout for arcus senilis since this pretty ring around the eye could prove to be more serious than a cosmetic issue.